Exmark Quest Hydraulic Fluid Maintenance

My friend has an Exmark Quest 48" zero turn. He asked me to find out how hard it is to change the hydraulic fluid. His hours are now at 250 and according to the owner's manual, a fluid change is required. The dealership told him that is must be done just right or the system can be ruined. Is there much truth to this. He would appreciate any further advice you could give him on the topic.

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